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1. Releasing goods without presenting original B/L is regarded as a "Cancer" of the modern B/L system.

2. The mechanism of the L system in modeling plant structure is analyzed first, and an appropriate encoding method of L system is explored.

3. Moreover, an improvement is made on the traditional L system algorithm for the convenient implementation of the proposed fusing method.

4. L system can be very realistic simulation of plant growth process.

5. To perfect B/L system will be of great help to the economic development.

6. Using Visualization Technology, this paper chooses L system as a formal description language to realize the visualization of inference course.

7. And this paper offers a method of concrete beam cracks simulation based on L system of fractal theory, and provides us a new way to visualize and simulate concrete crack.

8. From the evaluation tools, evaluation objects, evaluation methods and evaluation indexes, this paper discussed the evaluation l system of the modern library service.

9. It is difficult to realize the natural and realistic plant simulation only by use of the traditional L system or iteration function system (IFS) separately owing to the limitation of each method.

10. This paper presents a novel plant simulation method based on fusion of L system and iteration function system(IFS).

11. In this article we discuss the methods of 3D tree modeling by Iteration Function System(IFS)and L System based on the fractal.

12. Some key problems were addressed about the context sensitive L system in terms of the fundamental data structure.